Can't access blog after domain mapping

Yesterday I mapped http://stomachtoheart.com using the wordpress DNS nameserver settings on my domain registrars website (1and1.com). I also added a CNAME subdomain mapping entry for http://www.stomachtoheart.com since I want people accessing my website using the "www" subdomain link. Last night, after a few hours of waiting for the DNS entries to update, everything worked correctly. This morning it is not working at all. Now both my website is pointing to a 1and1.com parked domain page. It happens when typing in stomachtoheart.com and http://www.stomachtoheart.com. Is there something I am doing incorrectly or do I have to wait longer for the DNS settings to update? Any help is appreciated.

It can take domain changes up to 72 hours (though usually much less) to propagate to your ISP. Unfortunately, we have no control over this as it all depends on how often your ISP refreshes their DNS cache.